When playing, randomly the world will glitch out and part of it will become unusable in the sense that it "un renders". When this happens sometimes the game crashes, while other times if you go into this area you will get stuck in it. I also thought id mention that if someone else joins the game, this bug doesnt not happen to them. footage of the glitch can be found here
https://twitter.com/wildthegamer_/status/973325115218956289
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-19308.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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